That exact chocolate is my preferred one. The sugar is negligible really, at least when you eat it in reasonable quantities. I have a bar in my desk drawer here and will have a couple of squares as a "dessert" from my lunch, or as a snack now and then. Six squares (20g) = 4g of sugar total. But you ate 75g? We're talking ~500 calories worth of chocolate... I think you just OD'd a little . Those bars are not like a snickers bar where you're meant to open it and eat the whole thing

I eat 85% Vivanni dark chocolate every single day. I eat 1-2 squares. It's amazing and just enough to make me never crave anything sweet. (Right now I'm on a Whole 30 and so I'm not eating it and it hasn't been tough, though I plan on adding it back in since I consider it a "superfood")

I generally stay in the 90% range and have never had an adverse reaction. I finally just quit buying the bars about 6 months ago because I'd demolish them as soon as I got them home. My wife makes dark chocolate on occasion using a bit of honey as the sweetner.. that stuff is amazing.

That exact chocolate is my preferred one. The sugar is negligible really, at least when you eat it in reasonable quantities. I have a bar in my desk drawer here and will have a couple of squares as a "dessert" from my lunch, or as a snack now and then. Six squares (20g) = 4g of sugar total. But you ate 75g? We're talking ~500 calories worth of chocolate... I think you just OD'd a little . Those bars are not like a snickers bar where you're meant to open it and eat the whole thing

+1

I find a square or two (or three on bad days) is just perfect. Especially, if you really savor it, letting it sit in your mouth as it melts. Mmmmmmmmm My favorite chocolate bar of late Dolfin (Belgium chocolate) at 88%. It's really rich.

Aside from the fact that 75g at onve might indeed be too much chocolate, I find it hard to believe that it was sugar that caused the discomfort - 10 g of sugar isn't a can of coke or a donut.
Before this treat had you cut chocolate out completely and now re-introduced it? It might be a sign of intolerance to cocoa rather than sugar. Do you have access to some 100% chocolate or nibs to check that?
My IgG test actually showed I am very slightly intolerant to chocolate but elimination-reintroduction didn't really show anything, so now I have some chock (80-99% or raw choc/nibs) once in a while (sometimes even more than 75g)

The 88% Dolfin is amazing indeed - I discovered it just a couple of weeks ago. Dolfin in general are really nice although I try to keep away from "commercial" chocolate, choosing organic/raw, if I can.